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Peng Zhao
Department of Environmental Engineering, School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China

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Journal article
Published: 22 October 2020 in Separation and Purification Technology
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The challenges encountered in solid–liquid separation hinder the wide applications of carbon nanotube adsorbents. To overcome this problem, MnFe2O4/multiwalled carbon nanotubes (MMWCNTs) that combined the satisfactory adsorption properties of multiwalled carbon nanotubes (MWCNTs) with the magnetic separation of nanoparticles (MnFe2O4) was developed. MMWCNTs with a size of 10–50 nm exhibited remarkable magnetic separability (10.8 emu/g) and high adsorption capacity (qm = 494.91 mg/g, 308 K). Batch experiments to study the effect of pH on tetracycline (TC) adsorption showed that when the TC concentration was less than 80 mg L−1, the MMWCNTs could effectively adsorb TC in the pH range of 2–10, with a removal efficiency greater than 80%. The well fitted pseudo-second-order dynamic adsorption model and Langmuir isotherm indicated that the TC adsorption onto MMWCNTs mainly involved chemical and monolayer adsorption. Since the TC adsorption process was endothermic, increasing temperature could favor TC removal. Besides, after six cycles of regeneration with the NaOH solution, the removal efficiency could be maintained at 70% of the original, which indicated that the MMWCNTs had an excellent regeneration performance. At the same time, the results of our research showed that MMCWNT could not only be used as a good adsorbent for TC treatment, but also could be applied to other types of wastewater treatment.

ACS Style

Weigao Zhao; Yimei Tian; Xianxian Chu; Limin Cui; Hongwei Zhang; Mei Li; Peng Zhao. Preparation and characteristics of a magnetic carbon nanotube adsorbent: Its efficient adsorption and recoverable performances. Separation and Purification Technology 2020, 257, 117917 .

AMA Style

Weigao Zhao, Yimei Tian, Xianxian Chu, Limin Cui, Hongwei Zhang, Mei Li, Peng Zhao. Preparation and characteristics of a magnetic carbon nanotube adsorbent: Its efficient adsorption and recoverable performances. Separation and Purification Technology. 2020; 257 ():117917.

Chicago/Turabian Style

Weigao Zhao; Yimei Tian; Xianxian Chu; Limin Cui; Hongwei Zhang; Mei Li; Peng Zhao. 2020. "Preparation and characteristics of a magnetic carbon nanotube adsorbent: Its efficient adsorption and recoverable performances." Separation and Purification Technology 257, no. : 117917.

Journal article
Published: 13 December 2018 in Journal of Cleaner Production
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Cobenefits between water and energy are always pursued for urban planning since their consumption has a significant influence on each resource. To achieve the optimal conservation of both resources, i.e., reducing energy consumption while resolving water resource problems, this study established a new water resource allocation optimization tool with traditional water resources (such as surface water and ground water) and untraditional water resources (such as reclaimed water and desalinated water) using a multiobjective model with an evolutionary algorithm, which minimized the water consumption of freshwater and lowered the energy consumption of the system. To validate the model, the water resource system in Tianjin, one of the metropolitans in China, was simulated to provide the optimal water and energy conservation plan on a Pareto frontier. Our results suggest that at least 17% of current freshwater consumption could be decreased with less energy contribution by using imported water and a centralized supply in Tianjin. Furthermore, a minimum of 3.15 kWh of energy input would be required to save 1 m3 of fresh water with the assumption of linear regression fitting of the Pareto frontier in the water allocation plan. In addition, a sensitivity analysis was performed to determine the effects of variations in the demand/supply volumes as well as the energy supply involved in untraditional water resources. Thus, our optimization model can help policy makers identify water and energy cobenefits under different water allocation plans and provide valuable references for the optimization of the water and energy nexus.

ACS Style

Jinjing Gao; Chenlong Li; Peng Zhao; Hongwei Zhang; Guozhu Mao; Yuan Wang. Insights into water-energy cobenefits and trade-offs in water resource management. Journal of Cleaner Production 2018, 213, 1188 -1203.

AMA Style

Jinjing Gao, Chenlong Li, Peng Zhao, Hongwei Zhang, Guozhu Mao, Yuan Wang. Insights into water-energy cobenefits and trade-offs in water resource management. Journal of Cleaner Production. 2018; 213 ():1188-1203.

Chicago/Turabian Style

Jinjing Gao; Chenlong Li; Peng Zhao; Hongwei Zhang; Guozhu Mao; Yuan Wang. 2018. "Insights into water-energy cobenefits and trade-offs in water resource management." Journal of Cleaner Production 213, no. : 1188-1203.

Review
Published: 14 April 2018 in Sustainability
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As two indispensable resources for human development, energy and water are closely related. China, as the world’s largest consumer of electricity, is also experiencing very serious water shortages. Understanding the water consumption intensity in various types of electric power production technologies according to China’s national conditions is a prerequisite for understanding the potential impact of electrical power production on water resources. Therefore, following the steps of a meta-analysis, this paper provides a literature review on operational water withdrawal and consumption factors for electricity generation technology in China. We observed that 50% of water consumption for electricity generation was for coal power, whereas there was no research on the water consumption intensity of natural gas power generation, and a shortage of studies on water intake during electrical power production. The average water consumption intensity of hydropower is the largest. The results indicate that compared with other fuel types, hydropower is not a sustainable energy with respect to water conservation, and the study of hydropower applications should be improved in China.

ACS Style

Jinjing Gao; Peng Zhao; Hongwei Zhang; Guozhu Mao; Yuan Wang. Operational Water Withdrawal and Consumption Factors for Electricity Generation Technology in China—A Literature Review. Sustainability 2018, 10, 1181 .

AMA Style

Jinjing Gao, Peng Zhao, Hongwei Zhang, Guozhu Mao, Yuan Wang. Operational Water Withdrawal and Consumption Factors for Electricity Generation Technology in China—A Literature Review. Sustainability. 2018; 10 (4):1181.

Chicago/Turabian Style

Jinjing Gao; Peng Zhao; Hongwei Zhang; Guozhu Mao; Yuan Wang. 2018. "Operational Water Withdrawal and Consumption Factors for Electricity Generation Technology in China—A Literature Review." Sustainability 10, no. 4: 1181.

Journal article
Published: 31 July 2017 in Scientific Reports
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Chloride is reported to play a significant role in corrosion reactions, products and kinetics of ferrous metals. To enhance the understanding of the effects of soil environments, especially the saline soils with high levels of chloride, on the corrosion of ductile iron and carbon steel, a 3-month corrosion test was carried out by exposing ferrous metals to soils of six chloride concentrations. The surface morphology, rust compositions and corrosion kinetics were comprehensively studied by visual observation, scanning electron microscopy (SEM), X-Ray diffraction (XRD), weight loss, pit depth measurement, linear polarization and electrochemical impedance spectroscopy (EIS) measurements. It showed that chloride ions influenced the characteristics and compositions of rust layers by diverting and participating in corrosion reactions. α-FeOOH, γ-FeOOH and iron oxides were major corrosion products, while β-Fe8O8(OH)8Cl1.35 rather than β-FeOOH was formed when high chloride concentrations were provided. Chloride also suppressed the decreasing of corrosion rates, whereas increased the difficulty in the diffusion process by thickening the rust layers and transforming the rust compositions. Carbon steel is more susceptible to chloride attacks than ductile iron. The corrosion kinetics of ductile iron and carbon steel corresponded with the probabilistic and bilinear model respectively.

ACS Style

Yarong Song; Guangming Jiang; Ying Chen; Peng Zhao; Yimei Tian. Effects of chloride ions on corrosion of ductile iron and carbon steel in soil environments. Scientific Reports 2017, 7, 1 -13.

AMA Style

Yarong Song, Guangming Jiang, Ying Chen, Peng Zhao, Yimei Tian. Effects of chloride ions on corrosion of ductile iron and carbon steel in soil environments. Scientific Reports. 2017; 7 (1):1-13.

Chicago/Turabian Style

Yarong Song; Guangming Jiang; Ying Chen; Peng Zhao; Yimei Tian. 2017. "Effects of chloride ions on corrosion of ductile iron and carbon steel in soil environments." Scientific Reports 7, no. 1: 1-13.

Journal article
Published: 01 January 2015 in Chemosphere
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Deterioration and leakage of drinking water in distribution systems have been a major issue in the water industry for years, which are associated with corrosion. This paper discovers that occluded water in the scales of the pipes has an acidic environment and high concentration of iron, manganese, chloride, sulfate and nitrate, which aggravates many pipeline leakage accidents. Six types of water samples have been analyzed under the flowing and stagnant periods. Both the water in the exterior of the tubercles and stagnant water carry suspended iron particles, which explains the occurrence of "red water" when the system hydraulic conditions change. Nitrate is more concentrated in occluded water under flowing condition in comparison with that in flowing water. However, the concentration of nitrate in occluded water under stagnant condition is found to be less than that in stagnant water. A high concentration of manganese is found to exist in steady water, occluded water and stagnant water. These findings impact secondary pollution and the corrosion of pipes and containers used in drinking water distribution systems. The unique method that taking occluded water from tiny holes which were drilled from the pipes' exteriors carefully according to the positions of corrosion scales has an important contribution to research on corrosion in distribution systems. And this paper furthers our understanding and contributes to the growing body of knowledge regarding occluded environments in corrosion scales.

ACS Style

Huiyan Tong; Peng Zhao; Hongwei Zhang; Yimei Tian; Xi Chen; Weigao Zhao; Mei Li. Identification and characterization of steady and occluded water in drinking water distribution systems. Chemosphere 2015, 119, 1141 -1147.

AMA Style

Huiyan Tong, Peng Zhao, Hongwei Zhang, Yimei Tian, Xi Chen, Weigao Zhao, Mei Li. Identification and characterization of steady and occluded water in drinking water distribution systems. Chemosphere. 2015; 119 ():1141-1147.

Chicago/Turabian Style

Huiyan Tong; Peng Zhao; Hongwei Zhang; Yimei Tian; Xi Chen; Weigao Zhao; Mei Li. 2015. "Identification and characterization of steady and occluded water in drinking water distribution systems." Chemosphere 119, no. : 1141-1147.